As we work in a multi-platform environment it is important to
remain compatible with the Solaris utilities.
You could set _POSIX2_VERSION on the GNU/Linux system to 199209. From
(coreutils)Standards conformance
In a few cases, the GNU utilities' default behavior is
incompatible with the POSIX standard. To suppress these
incompatibilities, define the `POSIXLY_CORRECT' environment variable.
Unless you are checking for POSIX conformance, you probably do not
need to define `POSIXLY_CORRECT'.
Newer versions of POSIX are occasionally incompatible with older
versions. For example, older versions of POSIX required the command
`sort +1' to sort based on the second and succeeding fields in each
input line, but starting with POSIX 1003.1-2001 the same command is
required to sort the file named `+1', and you must instead use the
command `sort -k 2' to get the field-based sort.
The GNU utilities normally conform to the version of POSIX that is
standard for your system. To cause them to conform to a different
version of POSIX, define the `_POSIX2_VERSION' environment variable
to a value of the form YYYYMM specifying the year and month the
standard was adopted. Two values are currently supported for
`_POSIX2_VERSION': `199209' stands for POSIX 1003.2-1992, and
`200112' stands for POSIX 1003.1-2001. For example, if you are
running older software that assumes an older version of POSIX and
uses `sort +1', you can work around the compatibility problems by
setting `_POSIX2_VERSION=199209' in your environment.
If there are other areas of change I'd sure like to know.
See the NEWS file; all user-visible changes are noted there.
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